How to restore scratched and worn wood. Another pinner says: for watermarks - mix a thick paste of olive oil and salt and rub onto the wood - leave it for about 30 minutes. The salt draws out the moisture and the oil feeds the wood. Used this many, many times!
Learned this on Pinterest and tried it today! Heat oven to 500 degrees and put some marbles (you can put clear colored or clear with color in the middle) and heat for 20 mins...longer is OK but no better... After, put them in a bowl of cold water. I used a regular ceramic bowl and was afraid of shatter but nothing! It just cracks inside and creates GORGEOUS sparkles! Kids loved it and soooooo easy! Give it a try!