Wood burning stoves are a great addition to any home, you have a heat source independent from the national utility grids.
Many have glass doors so that you can enjoy watching the flames which is much better evening entertainment than your television!
Even if you only use good quality seasoned timber you will get a build up of tar on this glass and will want to clean it occasionally.
Many companies have developed various solutions that usually cost about £5 for a litre bottle.
This isn't expensive but in my opinion it is unnecessary.
Glass is naturally non stick so all that's required is a mild abrasive, simply place a piece of kitchen towel paper into water before dabbing into your ash pan so that it has ash stuck to it.
Then wipe across the stove glass, the ash will lift away the tar then simply use a fresh kitchen paper towel to wipe away the residue to have wonderfully clear glass so you can enjoy your next fire to the full.
I hope this has been of help to you and will save you wasting money, take care.