how do i get rid of clover in lawn properly?

Clover moves in where the grass is hungry, because it makes its own nitrogen and the grass can't. So feeding the lawn properly does more long term than any spray. Mow a bit higher too, around 3 inches, so the grass shades it out. If you want it gone faster, a selective broadleaf weedkiller labelled for clover works, and autumn is when it does the most. Small patches you can just pull, roots and all.