The best way to clean glass is with a vinegar and water solution. A 25% vinegar solution should be more than plenty. Spray it on, if you have a spray bottle. Most dollar stores carry them. Use newspaper to clean.
There is cork on a coaster so the glass or mug won't slip off and it saves the table from water marks.
White vinegar will dissolve most water spots and leave glass extremely shiny. Very stubborn marks may be calcium deposits or etches on the surface of the glass. CLR will remove the calcium, and if the scratches are not too severe, rubbing with a paste made of baking soda and water will polish them off.
If by "water marks" you mean the residue left from rain or splashing tap water, then white vinegar is your best bet. Apply the white vinegar to the glass, then wipe off with balled-up newspaper. The water marks are most probably "scale" or lime residue left when the water evaporated, and the white vinegar will dissolve the scale off the glass.
You can try a mixture of white vinegar and water to get white water marks off of linoleum. Use a scrub brush with the mixture to clean the area. If that does not work, clean the marks with toothpaste.
Yes, you can write on glass with dry erase markers, and the marks will wipe right off.
For a static window cling you just pull it off the glass and it leaves no marks. You can then just place it back in the paper to save for use another time.
There is an eraser for suede. It will rough up the nape and the water marks will disappear.
Mirrors, Glass, and Water
Yes, at first it will. But it will easily come off with hot water and if you let the glass object sit with the hot water in it.
Try using polishing compound. Your local auto parts store should carry it.
No, it will short out. You can however expose it to water as in washing off an auto battery.
A tall glass of water will help me to stave off my hunger pangs.