A house-cleaning business pays for a click from someone looking for cleaning jobs. The searcher wants employment, not an estimate for a home cleaning. The ad may have worked exactly as configured, but the visit has little value to the campaign selling cleaning services.

This is the kind of mismatch negative keywords can help prevent in Google Ads. They tell the system which searches should not trigger an ad. Used carefully, they can make a campaign more relevant. Used carelessly, they can also prevent real customers from finding you.

The goal is not to block the largest possible number of searches. It is to stop paying for clearly unsuitable ones while protecting the inquiries your business wants.

Find the Searches That Actually Triggered Your Ads

Start with the Search terms report, not a generic list of words someone on the internet says every advertiser should exclude. In Google Ads, go to Campaigns → Insights and reports → Search terms and select the campaign and date range you want to review. Google's search terms guidance explains how this report helps identify negative keyword candidates.

A keyword is something you target in your campaign. A search term is what someone actually typed before your ad appeared. The two need not be identical.

For each term you can see, ask whether the searcher is looking for a service you provide, in an area you serve, at a stage when your ad might reasonably help. Consider the intent, not just the wording:

  • Job seekers: A phrase such as “house cleaning jobs near me” may be irrelevant to an ad intended to sell residential cleaning appointments.
  • Products rather than services: “Where to buy lawn mower parts” is not a promising search for a company that only provides mowing visits.
  • A service you do not offer: “Carpet cleaning machine rental” may be unsuitable for a business offering professional move-out cleaning but no equipment rental.

These are hypothetical examples, not a ready-made exclusion list. A company that hires cleaners, sells equipment, or rents machines might make a different decision.

The report is also not a complete transcript of every search. Google's search terms report documentation explains that some lower-volume queries are omitted for privacy reasons. Use what is visible to find patterns; don't pretend you can account for every search or every dollar from the report alone.

Understand What Your Negative Keyword Will Block

For Search campaigns, Google offers three negative keyword match types. They behave differently from the positive keywords used to find customers, so choosing the wrong one can exclude more searches than intended.

Suppose a cleaning business wants to exclude people looking for employment:

  • Negative broad match: cleaning jobs can block searches containing both words, even in a different order. It will not necessarily block a search containing only one of them.
  • Negative phrase match: "cleaning jobs" blocks searches containing those words in that order, including a longer search such as “house cleaning jobs near me.”
  • Negative exact match: [cleaning jobs] blocks that exact search, but a longer phrase such as “cleaning jobs near me” can still be eligible.

Google's negative keyword match guide documents these distinctions. Negative keywords also do not automatically cover every close variation or synonym. For instance, excluding job does not mean every possible employment-related search is covered.

Start as narrowly as the evidence allows. If one exact query is clearly unsuitable, consider excluding that query before expanding the restriction to a whole family of searches. Review the potential effect of a broader exclusion before applying it.

Avoid Blocking Words That Can Signal a Real Customer

“Free,” “cheap,” “jobs,” and “DIY” are often suggested as universal negative keywords. They are not universal answers.

A handyman business offering free estimates could lose relevant searches if it excludes free across its Search campaign. A homeowner asking about the cost of a cleaning service may still be evaluating a legitimate purchase, even if the search includes cheap. And a landscaping company running a separate recruiting campaign has a reason to reach job seekers in that campaign.

The same warning applies to service names. A lawn-care company that excludes landscaping broadly could miss homeowners using that term loosely to describe mowing or seasonal cleanup. Before rejecting a query, ask what that customer likely meant and whether the business would actually accept the work.

Irrelevant to one campaign does not necessarily mean irrelevant to the entire business. Keep the scope of your exclusions aligned with what each campaign is meant to accomplish.

Apply Exclusions at the Right Level

Google Ads lets advertisers add negative keywords to a Search ad group, campaign, or shared list. It also supports account-level exclusions for relevant Search and Shopping inventory. Google's setup instructions explain these options.

Use the narrowest level that solves the problem. If one ad group promotes move-out cleaning and another promotes office cleaning, a search irrelevant to one service may still be relevant to the other. A campaign-level exclusion reaches further, while an account-level negative can affect multiple campaigns with different goals.

When adding terms from the Search terms report, check the match type before saving. Google says negative keywords added to a Search campaign from that report default to negative exact match. A shared exclusion list is useful when the same genuinely unsuitable intent affects several campaigns, but only after checking that none of them needs those searches.

Performance Max has its own controls: Google currently supports negative keywords at the campaign and account levels, but they apply to its Search and Shopping inventory, not every channel where Performance Max can serve. If you run that campaign type, check its specific instructions rather than assuming Search-campaign settings work identically.

Check the Results Without Assuming Every Click Was Waste

After adding an exclusion, review the relevant Search campaign over a meaningful period. Look at the search terms still appearing, the cost of those searches where data is available, and whether the business is receiving relevant estimate requests or calls.

A click that did not produce a recorded conversion is not automatically irrelevant. Tracking may be incomplete, a customer may call later, or the person may still be deciding. Conversely, a reported form submission is not necessarily a qualified job lead. Compare the advertising data with inquiries the business actually receives.

If relevant search traffic or qualified inquiries fall after an exclusion, revisit the term and its match type. Negative keywords are editable; they should not be treated as a list that grows forever without review.

Also remember that poor lead quality can have more than one cause. A confusing service page, an overly broad service promise, or location targeting that doesn't match the business's coverage may need attention separately. Adding negatives will not fix every problem in a campaign.

Keep the Review Small and Specific

A useful routine for a small service business is to examine visible search terms, flag a few clear mismatches, decide the narrowest exclusion that makes sense, and check the outcome. Record why each important negative was added so it can be reconsidered if the business expands its services.

You do not need hundreds of exclusions to prove that a campaign is being managed carefully. You need a clear answer to a simpler question: Are we keeping ads away from searches we cannot serve without making it harder for the right customers to reach us?

That's a more defensible advertising decision than automatically blocking every search that hasn't produced a booking yet.

Sources and Further Reading