Easy-Lease every time, if you have some use it. Forget the wax and PVA.
Assuming that you have used the wax and PVA on the same piece of glass start by cleaning /degreasing the glass with either mould cleaner or panel wipe.
Then apply 4 or 5 coats of the Easy-Lease as per the instructions. You are only looking at putting down a thin layer. And use a clean piece of cloth (good quality kitchen roll is fine) for every coat applied. But after applying it don't buff it like you would wax, just a light wipe over with a clean piece of lint free cloth is all that is required. If you buff it too hard you will actually be removing the Easy-Lease.
The Easy-Lease forms a barrier layer between the mould and the Resin and very little is transferred onto the surface of the part, that is why you can get multiple pulls from a mould ( I average about 10 pulls) before having to apply another coat of Easy-Lease.
Once cured and de-moulded a quick buff and wax and the surface of the part should be exactly the same as the finish of the mould, in your case glass.
Hope that helps Warren