Here's 9 tips you can use to keep you hair clean, these tips apply to all hair types. Keeping your hair clean is one of the fundamentals for hygiene, our hairs has many germs so it's very important to keep your hair clean all the time. The attach video will show exactly what to do.
You can install tile over tile. However here are the risks. The new tiles will require at least 3/16" of tile adhesive UNDER the tiles when put in place after they have been pressed into position. Additionally the trim around the tiles willhave to be removed and elevated the distance of the tile thickness and the 3/16" grout distance. The tiles if on the second floor of a home will easily losen due to the expansion and contraction of the home and the difference in the 2 types of tiles expansion and contraction rates.
It is not difficult to remove old tiles. You use a flat bar type scraping tool and the old tiles usually will pop right up off the floor. You will have to break maybe 2 tiles to get started but after that they are easy to remove.
My experience in my own fully tiled in all rooms 2900 sq ft home in the tropics is that I have to remove the old tiles as over time the new tiles losen on top of the old tiles. I have tried it several times and have had at least 1 tile come loose each time.