Do the laser cleaning CDs do anything?

The scenario that has come up that prompted me to use my Discwasher device was when a player was already having problems playing discs reliably, ie skipping, dropouts, etc. and cleaning the disc itself did not help. At some point, if a player is already apparently not working as it should, there is probably little harm in trying to clean the laser however possible. But again, I have not had much success with the Discwasher device delivering any results.

works almost the same way as if you hit 100mm nail with table spoon instead of hammer.

I used one of those on a Sony Playstation for my son and it worked. Before using it the disk would not play. After using it the disk worked. Never tried it on a CD player

Recently got an RCA/Discwasher cleaner for CD/DVD laser lens.
It is a dry system. No fluids involved. There are several
tiny brushes at various positions around the disc penetrating
and perpendicular to the shiny side of the CD). At a price of
$15 it seemed worthwhile + it has a "demagnitizing"
function! as well as 9 diagnostic tests!! AFTER USING IT THE
FIRST TIME IT WAS LIKE A COMPONENT UPGRADE!!! BETTER THAN
CHANGING OUT POWER CORDS!!!! Sorry, couldn't help myself. For
the few bucks it cost, why not just get one and see if you
hear something magical? I did not.