I have been known to spray the area under the seat with engine cleaner andrinse it offwith a garden hose on a nice warm day leaving the seat off until it dries in the sun. I wipe it all down after it dries to finish the job. I'm not recommending this process but I do it about once a year and haven't had any problems result yet. I do know there's a slight risk and I'm willing to repair any damage done. I doubt I'm getting anything wet that doesn't get wet when riding in the rain. For normal cleaning during the year Lemon Pledge does the job.