Clean out the rinse holes
If your toilet flushes slowly, the rinse holes under the rim may be clogged with mineral deposits. With a mirror and a coat hanger, you can clean out those clogged holes without ever getting your hands dirty. The photo says it all—look into the mirror to see if the holes are clogged. If they are, bend a coat hanger flat and probe the tip into the holes to poke out any mineral deposits.