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If you have a cabin air filter, take out the cabin air filter and add the cleaning agent directly into the box. It will then run out the a/c drain. Then put in a new cabin filter. If you don’t have a cabin filter,, you may need to get a kit that allows you to add directly into the box. Personally I don’t think spraying into the intake is going to allow it to penetrate down to the box where the issue is.
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