Photoshop :: Removing A Partial Blue Screen

I capture a lot of brochures from holiday trips etc including outline maps of local areas. I then add rthese to albums, shows etc.

When I scan these, they frequently include a significant blue (sometimes grey) tint most noticeable at the edges or on folds in the items being scanned, presumably representing areas where the contact between the document and the glass is not quite as good as elsewhere.

I've tried weighing down the scanner lid, but I've not noticed any noticeable improvement.I'm now playing with the settings to see if I shoude be tweaking anything to improve this.

In the meantime, I'm left with a number of docs to clean. I've been doing this with the clone tool, but it is very time consuming.