How much, as in square inches or feet, of vinyl cushions will one 15 oz tube clean?

Plenty. Like at least the entire car seats of three or four average size cars.

After applying the cleaner ,should it be rinsed off ?

Yes, in most cases. Per their website: APPLICATION: 1. Apply SEM Soap to a gray scuff pad 2. Scrub panel thoroughly until surface is clean and finish is dull 3. Rinse with water. Note: When cleaning leather or vinyl, do not rinse with water. Instead, wipe away SEM Soap with a clean, damp towel to remove all residue. Allow to fully dry then repair or refinish according to manufacturer’s instructions

this type of soap was recommended to clean the plastic in a car. Better than dish soap. true???

I have always had good luck using Dawn dish soap for cleaning, except maybe for unwanted excess sudsing. However when I had to refinish my vinyl boat cushions using the SEM vinyl paint, I called SEM in South Carolina. They said the reason to use their soap over regular dish soap to pre-clean the vinyl was because it left no residue. Apparently, with added ingredients, dish soap does. And obviously any residue will prevent the paint from adhering properly.

Global Trade Identification Number	00646786393624
Manufacturer	SEM
Age Range	Adult
Color	As Shown in the Image
Height	2.7 inches
Length	5.2 inches
Weight	1.01 Pounds
Width	2.7 inches
Material Type	leather, vinyl
Number of Items	1
Features	Abrasive
Usage	Automotive Interior
Batteries Included?	No
Item model number	39362
Product Dimensions	13.21 x 6.86 x 6.86 cm; 181.44 g
ASIN	B000I1DJDG

SEM 39362 Soap - 15 oz.

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