RE: Need you opinion on portholes
Not much point in cleaning them unless you want to polish then weekly. If you want to clean them, 1TB citric acid / cup of water with a couple of drops of dishwashing detergent will clean them up well as a soak. If they have a coating on them, you'll have to soak in a solvent like lacquer thinner to get that off first.
Don't put polymers in there; if you want to replace the glass just use clear or tinted safety glass. If you do that, seal the edges of the new pieces with a smear of silicone or polysulfide caulking.
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