There's no real test for silicone. The 3 methods to deal with it are to either A) try to clean it off, or B) seal it in, or C) add silicone or "fish-eye remover" to your stain and finish.
Note: If you opt for C, the equipment (brushes, mixers, containers, spray gun and nozzles, etc.) will always thereafter have to be used with a fish-eye remover. If you're lucky a goodsoaking in lac thinner can sometimes remove the silicone from our gun & needles, but never from brushes.
Once the wood is stripped you can try scrubbinbg with a TSP solution. The other is to seal it in with shellac. I find that rubbing all aufaces with lacquer thinner before spraying shellac, seems to work.
Bob "Boardman" Borders