I tried some method that proved to be working even on very stubborn seeds.
Whether you are going to use paper towel or class of water does not seem to matter much but I will give you three options and all have worked fine with me.
All you need is Hydrogen Peroxide( I used 3% solution)
Use about one teaspoon of Hydrogen Peroxide on a glass of water(250ml) and mix it with water. If you want it simple just drop your seeds into a glass and put it on a window seal as it is. Do not worry about sunlight, it actually will help if it is exposed to sunlight for some time.
For the second and third method use the same solution that you mix in a glass of water and a zip bag but instead of dropping your seeds in a glass water you can do either of the following:
1) put a bit of perlite in a zip bag, pour a bit of solution in it but not to a point that perlite is floating in a bag. Then put your seeds in a bag so they are touching perlite. Zip the bag and put it on a window seal.
2) do the same but instead use a paper towel wet in this solution. Wrap your seeds in the paper towel, zip it and put it on a window seal.
I think the best one will be with perlite as you can see when they germinate. I tried all three and and seems that they are germinating within a day in a zipped bag and they can even start growing green stem inside if you keep them there for a long time. I would say I have had almost like 100% rate this way. Without Hydrogen Peroxide and exactly the same seeds I barely could germinate 1 seed out of 10.
Do not be scared to open a zip bag to look inside. I have done it many times and it has not affected anything.