Clean foam residue off windows
That is most likely expandable foam that is used to seal air spaces. It has VERY sticky and can even bound with some plastics. It is very hard or impossible to completely remove and it will likely either need to be replaced or some cover-up applied (I have not heard of this or know of what could be done)

Your builder almost surely wants you to just go away. What do they have to gain from fixing it? Your future business? It is VERY common for contractors and builders to ignore you unless you continue to press HARD. This should be addressed by them, after all, you paid for this to be correct and you did not receive a credit for this poor condition, you should NOT HAVE TO LIVE WITH IT. If they start a pattern of vagueness / no commitment or give a longer time frame before they can address it (pretty much anything other than doing it now) then they are putting you off hoping that you will give up. Don't give up. Get legal help if you need to.