You can wash with regular car soap; it will be fine. 303 makes a cleaner product if you had tree sap, dried-on bird poop etc., that the car soap did not remove adequately. Be sure you get the 303 top protectant for a fabric top NOT vinyl. You will need to mask off the windows, body and anything else you don't want the repellent on; it comes in a spray bottle. You could also put it in a small plastic bowl and use a paint brush to apply, my approach. Here are the 303 UPC's; Fabric Protectant: 082043006164, Cleaner 082043005402, it may also come in a combo kit.
Just ordered!! Thanks. So you can use regular car soap when washing just like a regular roof? I'm assuming just make sure to get it all rinsed off well so nothing adheres to the fabric.
Also was told to not treat it for a year since it came treated from factory and the roof is from March of this year. Gonna follow that, then use the 303 solution and paint brush like you explained. That sounds like the best option.
Are car washes ok sometimes or should be avoided at all cost? I assume if car wash then just regular soap and water wash and not their wax solutions as they would probably not be good for the top? Or does wax not affect the fabric?