try to use paint protection. either PPS or Sierra Glow.
next TT can come and i show u what is the benefit. you can clearly see my ride is a bit yellowish compared to my fren's ride. he's applying the Sierra Glow and the paint is still like new!!@#$

a bit regret in not applying those protection thingy.
for other color might not needed, but for a white car now i think is a must.

and he's washing his car less frequent than mine too!!