Diamond Sea Glaze are the best sliders out there, they are not
cheap. They can build to the size you need. Plexiglass windows can be restored, they do it on airplanes all the time. My son in law used to own a company that does it. What is your location?
If you are talking the teak floors, try a good
cleaning with regular house hold floor
cleaning supplies (not the kind that "auto wax" for vinyl etc) then you can assess the condition. Joy works great, TSP works greater but is enviro bad and you need gloves.
If you are talking bulkheads etc, take the time to clean it all with vinegar and
water or your favorite solution. Then you can assess what it needs better. If it was varnished not oiled, you need to determine if the wear and tear has gone through the last bit of
varnish. if there is exposed raw
wood or grey marks, then this has occurred and you might have to spot stain/match prior to proceeding. If it is just dull etc, light
sanding and recoating with a good varnish or
polyurethane (one part) will make it look nice. If it looks like it was just oiled, clean as above and reoil it. I have sucessfully used Daly's Sea Fin Teak
Oil over old
interior varnish and it worked quite well. It is a kind of sticky
oil, appears to be almost an oil/varnish mix... Pictures would help... Where were the defever's built? if
Taiwan, the
interior may be lacquer....