Earthshaker

I guess i should have added that i did quite a bit of searching and could not find anything

Hello all, I have a bullfrog spa that is about 2 years old - last one before full composite construction. The black plastic filter cover and pillow/jet pack holders are getting either oxidized or are staining "white" somehow and i can't seem to find a product to restore them to the nice black they were new. I would assume due to what some would call a harsh environment, but am a little suprised to say the least since this is what i figure a quality unit - all the same, some of the jet bezels are turning color as well, others are like new. Bizarre. Shell and cover are in perfect condition. My chemistry is on the light side if anything and the circ pump only operates on the minimum factory setting (which i feel i should increase). I always add sanitizer (Dichlor) after exiting the tub and allow to gas off for at least 20 minutes before closing the cover - speaking of cover, it is in like new condition. Are other Bullfrog owners experiencing same? What are you using to keep the plastic and pillows like new? Anybody have comments on the jet discoloration and why some are and some aren't? I use 303 Aerospace for the cover top (although i'm not talking about areas exposed to the air), have tried 303 on the plastic - no change, plastic polish for autos- no worky, Mothers back to black - nope, JimmyG's almost wet plastic treatment - nada. I feel these are all great products, but i can't seem to get results. FYI, I maintain 3ppm chlorine using Taylor DPD, 7.6ph and if i super sanitize, the cover is up for long periods to prevent cover deterioration specifically.