The best thing to do is clean the grips. This can be done easily, get some liquid soap and and nail brush, clean the grips, wash off and dry thoroughly with a towel. If your grips are shiny you should probably replace them, grips should be replaced every 40-50 rounds.
use sand paper on them
Lamkin sells golf grips, including specialty golf grips, putter grips, cleaning wipes, and other types of grips. They also offer training on how to properly use the grip.
There are many places online that have information on good or even great golf club grips. One of the best sites with information on these club grips is Google Reviews.
Unfortunately not, you can not use these grips at any level of official competition. The grips are against the rules because they have fixed hand positions.
Yes.
humidity
In the earlier days, leather was the material selected for golf club grips. They are still available today, but quite rare and expensive compared to other grips.
Golf Pride VDR Red
You shouldn't really use any house hold cleaner on golf club grips as it will destroy them, enjoy the mild ones. A clean towel and clean water is absolutely perfect. You can buy some specialist golf grip cleaners over the internet or in golf shops.
no
Yes, just make sure once you put it on you wet it with plenty of solvent, inside the grip and on the grip tape.
Hundred upon hundreds of different types of styles, colours, materials and sizes.