Ah I see

right ill have a look into this

Thankyou Purple Haze
If Im being honest I do wash it after use but Im guessing not good enough, Im all most 100% positive that some sort of blockage will be my problem.
Right now for another question............. Is snow foam OK on fabric roofs?



?
My car being a Audi A4 convertable, I have been trying to just use snowfoam on the body but its hard not to get some on the roof, Ive feared snow foam will stain or effect the waterproofing of my fabric roof?