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HDPE and Maple Shelves:

A soft rag and mild soap will clean-up most spills or stains. Goo Gone works very well on the stuborn stains.

Clear Acrylic Plastic Fronts/Backs

Window cleaner works.  Pledge Multi-Surface Cleaner works very well.  Strong chemicals may cause cracking in the Acrylic.

Ball Bearing Slides:

Add a little Petroleum Jelly to the moving and sliding parts if over time the slide movement is not as smooth.