Hello guys, I have an Opel Astra J GTC, color mineral white, such a light gray-white metallic. I usually do car washing once a month. The usual wash road at the tank, and if necessary repolize with Sonax wax. Today what it is again so far: wash road at the gas station nearby, drive home, sunshine, and I see so first brown dots. Both sides at the doors and lower surfaces. When looking more closely it is whole splashes or heaps of reddish-brown F I took my Sonax Xtreme BrilliantWax to polish it away. Unfortunately, it didn’t work. I didn’t know where these brown spots were coming from, nor did I ever have that. I’ll probably go to the workshop tomorrow and ask what helps. Did you ever have something like this? LG, Drago