The easiest and best way to remove the finish is to take it to a "dip strip" professional stripping service and let them do it. I did that with the last two stocks I did and they will remove the finish and stain leaving the wood bare, and ready for sanding and further finishing.
Citrus Strip works okay on water based finishes but on lacquer and oil finishes is slow and difficult. For those finishes you really need a stripper with methylene chloride in it. You need to use rubber gloves with it and be careful like any other industrial chemical.
I've used methylene chloride strippers for years. Generally, you have to go to a professional paint store to get them or a good hardware store. ZIP STRIP is one brand that can be found at most Ace and TruValue hardware stores and comes in liquid and spray cans. I prefer the liquid and apply it with a cheap, throw away brush.
If you want to scrape the wood - skip the glass and just use the correct tools which are, in fact, SCRAPERS. They come in different sizes and shapes and are made exactly for that purpose - scraping the finish off of wood.
But, the easiest and fastest way to get the stock to bare wood is to use a professional stripping service. You drop it off one day, and generally come back the next to pick up a clean, fully stripped, ready to finish piece of wood.
No muss, no chemicals, no time wasted stripping wood - and the final result will be better than you can do as they use a heated stripper in tanks - which you can't do.