or how do you best proceed?!

hello, nice to spring it starts today already… I’ve got a nice time on the roof …. well, I only saw it after partying and then with water and nem microfibre cloth “made away”.. now I have just this beautiful “rest” on it.. so somehow something like that ..I can’t really describe it.. looks like such a rest “liquid glue” or something.. you certainly know what I mean.. but how do you go from the moment you see it all done.. there’s some which tips so that I have absolutely no traces of it? I have a dark lacquer.. lavagrey…