A helmet liner in this climate is worth washing more often than people do. The liner comes out where it is designed to, is washed by hand and dried in the shade, and the shell is cleaned without solvent because solvent and a helmet shell are a bad combination.
We do not touch a visor with anything abrasive and we will not clean a helmet that has been dropped hard, because a cracked shell is not our news to break on the bench and you should see it yourself.
Seats are cleaned and fed on any visit over thirty minutes at no extra charge. A seat that is cracking on the seam is usually doing so because it has been left in the sun wet.