Agree with Hoosiersmoker
'Are you talking finished goods or WIP? If you're talking WIP, slip sheets and discard the bottom blanks. We wash all plastic pallets annually and monitor condition throughout the year. However, if you're talking finished goods, your agreement with your pallet supplier and Vendor Approval program should assure the required condition of your pallets and your in-house storage should maintain that condition (not stored outside at supplier or your facility, no discoloration, unknown substances etc.). It might mean a few cents more per pallet but it will also keep you out of trouble with your customers.'
That's exactly what we do for our direct contact cartonboard food packaging.