My best way to date, after many trials and experiments, is now:
Take a hot cloth and clean the face. Use paper towels to dry. In a bowl, mix cornstarch and hydrogen peroxide until it is barely a liquid and hardly a solid. It makes a very unique type of paste, where it is too thick to get with your finger so you need to kind of dig it out. Once it touches the moist skin folds and you fingers, it will become more liquified again. Careful not to get in the eyes or in the nose. I let this "dry" for a good half hour, then I carefully put desitin where the "tear" stains would be.
Now, if you have yeast in any folds you will need an anti yeast medication. Animax creme works very well, but there are others. You need a prescription from your vet for this. I apply this anywhere I find yeast- under the nose rope, in the tail pocket, and even in the vaginal area if it is "tucked" and gets yeast. You can also use human yeast wipes for these areas as well. I do the face treatment of peroxide and desitin at least every 2-3 days, but I wipe face with hot cloth daily. I only treat for yeast as needed.
We will use off brand stridex pads as well to clean out bad folds, but if the fold is raw, your bully will likely go nuts.
I will also use buggies baby wipes here and there instead of hot cloth. These are not very moist.
We all have our ways of doing this, but the main problem could be your food. Low grade foods cause horrible skin issues in bullies. What are you feeding?
I am certain you will get many more tips as well . Let's get your bully in fabulous shape and feeling good, cuz those nasty wrinkles are very uncomfortable