I've had an outfit that has cleaned my driveway several times in 3
year intervals. They use this rotary thing that looks like a lawn
mower when doing my driveway (about 5 car lengths). I notice that
when they finish and it's dry, it has a tight grab on your shoes when
you walk on it... sorta like when you wear very rubbery shoes on a new
shiny wood floor. The driveway is definitely clean looking when they
finish it but I wonder if over repeated cleanings, it eats away at the
concrete finish? I realize without knowing the pressure, etc... this
question may be hard to answer but assume this company is legit and
following the correct procedures for cleaning a driveway. Am I crazy
or is my suspicion correct? Either way, is there a suggested time
interval to clean a driveway?