Grinders and drills are not for cleaning tiles. At the most aggressive level you may want a rotary wire brush to fit in your drill.
Just as you said....drill the centers out of them. If you are talking about the large rivets that hold ball joints in....that's another story. It's easier to use an air chisel or grinder on them and carefully grind the heads off without cutting up the control arm. Then punch them through. If you don't have an air grinder a GOOD metal chisel and big hammer will do it....probably faster than the drill.
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You must be careful not to scratch the surface of the tiles. It is best to use soap and water and a soft cloth.
You use a carbide tipped drill bit for tiles. If the holes are for faucets or similar size, you use a diamond tipped holesaw. Available in many sizes at Home Depot and many good tool stores.
You can try cleaning the yellowing floor tiles with a mixture of baking soda and water or a commercial tile cleaner specifically designed for whitening. For persistent stains, you may need to consider professional cleaning or resealing the tiles. Regular maintenance and cleaning can also help prevent future yellowing.
Grinding coffee!
I have bought a new drill today.
To sharpen a pepper mill grinder, first, disassemble the mill to access the grinding mechanism. Use a fine-grit sandpaper or a sharpening stone to gently grind the metal burrs, being careful not to remove too much material. Reassemble the mill and test it with a few peppercorns to ensure it's grinding effectively. Regular maintenance, such as cleaning and avoiding moisture, can also help keep the grinder in good condition.
The cost for a Hitachi Drill can differ. A good place to find a Hitachi Drill is Lowes. Lowes has great prices and a person can find a Hitachi Drill for a good price.
Grind. A good grinder can get to lv18 in a day. A great grinder can get to lv18 in a matter of hours.
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Cobalt drill bits are good