ONR safe to use after not washing car for a month?

its fine.. just put some in a spray bottle that is deluted at qd level or at wash level and spray your bad spots before washing... i never had any problems and i use onr 99% of the time. my truck always has a fresh coat of wax so it cleans really well

I work in a similar way. If the paint is very dirty I would spray the panel with ONR, leave it to dwell for a short time and then wash in the normal way
 
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