With pepper seeds, just let them dry out a week. Make sure to label everything else you will forget.I put labeled seed packets with the seeds.
Tomatoes, my method is even easier. Save seeds and gel in a canning jar. You need enough water to be able to form mold. I add a few tablespoons. Depends how many tomatoes I’m using. If a few usually enough water there not to add any, or say from pastes with few seeds and gel, you need to add water. You don’t have to cover, if you do open it to air out every other day. If left open it attracts flies and stinks to high heaven. But you can leave it open too. It does not need to be in the sun. I never put them in the sun. In 3-5 days a solid mold patch forms. Once this happens you can now harvest them. I usually wait a week anyway. fill jar with water, the gunk and mold float and good seeds sink. Let seeds settle to bottom and pour off the gunk and repeat 3 or 4 times till seeds are clean. I’m not putting that mold in my strainer. As Dale said hit strainer on paper plate or paper towel, mark first! Spread seeds out, I just use my fingers, some use a knife, much faster with my fingers.Let dry a couple weeks, you want them bone dry. Seeds stick to paper towel, a plate is easier, but I don’t keep paper plates at my house, only at my cottage.