dumb question what is all purpose cleaner

It's a product. APC = All purpose cleaner. There are several companies that make APCs, including Poorboy's and Meguiars.
 
All-purpose Cleaners (APCs) are generally concentrated cleaning formulas made to clean a variety of surfaces. Several manufacturers make APCs. Some of the favorites around here are Meguiars APC, Costco's APC, etc. They are to be diluted with water for cleaning such areas as carpet/upholstery, leather/vinyl, plastic trim, tires, wheel wells, etc. The dilution level will vary depending on the surface. A 10:1 dilution, or a little weaker is good for cleaning carpets and upholstery. You would need a stronger dilution say for degreasing an engine, cleaning tires or wheel wells.
 
I would think that an 'all purpose cleaner' is the type of product that can be used to clean many different things. Of course, just because it's called an all purpose cleaner, that does not mean that it can clean everything. It's just that they are able to be used for many purposes.
 
With the right dilutions, and ensuring a proper rinse afterwards, I think that APC's can be used on every surface in the car... The two APC's that I use are the ones made by poorboy's and the one made by meguiar's.
 
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