With all the aluminum we put on these machines it can be a pain to keep it looking nice. You can do a couple things to keep your last polish job looking good. After washing, get the water dried or blown off the aluminum as soon as possible. Mix a spray bottle up of a 50/50 mix of water and viniger. Spray it on a clean,soft cloth and wipe everything down then finish with a soft dry cloth. It will remove any left over water spots and protect it. This mix can also be used on painted surfaces to remove water spots with excellent results and 0 harm to your surface. I have been doing this for years, it works awesome and saves a bunch of elbow grease.