Anti foaming agents can I harm anything

[Barryvw]

I have strict by laws about washing cars with soap I wonder if I used an anti foaming agent. Will the car shampoo still be effective and can it cause any harm to cars

 

[Setec Astronomy]

Why not use a rinseless wash?

Duragloss Rinseless Wash with Aquawax, no rinse car wash, rinseless auto wash
Meguiars Rinse Free Express Wash, rinseless car wash, no rinse
Optimum No Rinse Wash & Shine: clay lubricant, optimum rinseless wash, no rinse car wash, optimum detailing products
Optimum No Rinse Wash & Wax, no rinse car wash, rinse free car wash, optimum no rinse
BLACKFIRE Wet Diamond Rinseless Wash, no rinse car wash
Pinnacle Liquid Gloss Rinseless Wash with Carnauba, no rinse car wash, eco friendly car wash products

 

[neat e34]

Adding ONR to a normal shampoo mixture can reduce suds.
I've only added an oz but I suppose if you added a couple you may be able to kill all the suds?

Or as suggested use a rinseless...

 

[silverfox]

I think a good product for you would be Meguiars express rinseless wash. It actually has some suds produced (not a lot) to give you the peace of mind that suds seem to give people, yet it is an excellent rinseless wash with superior cleaning ability.

For pure cleaning its really a great product. It doesn't add anything to the paint. It's safe and effective. A no nonsense product that just plain works.