I love the Lego F1 discontinued sets, however the stickers wear out after a while, and I just ordered some replacement stickers, which got me thinking... When do you guys apply stickers included in sets? I used to do them as I go, However, I realize now that it may have been better waiting until I was finished.... Also, I am a nurse and I have endless supplies of alcohol prep-pads, are these good to clean the pieces before applying the stickers?