Does anyone know of any effective cleaners for the Sundeck vinyl upholstery to get out the grimy body and tanning oil stains ? I have white vinyl captain’s helm and related benches that are very dirty and hard to clean. I recently redid several seats and seat backs so the remaining seats look awful but the expense to redo the rest is exorbitant! So before I take that plunge I would like to give it another go with a deep cleaning if anything is out there that works! Help!