where did you purchase your 'kona red'? it is not all created equal- places like (joannes) tend to label their solids 'kona' when they really are not-
some of them never stop bleeding- until they are just barely pink. you can 'try' retayne- follow the instructions-
a good, (real) kona solid from a quilt shop is not as apt to bleed- bella and moda solids are also good solids. I've used kona solids for years and have never had one bleed, red, black, deep blue, purple...none of them. it's best to keep washing it until it does not bleed any more if you want to use it- or use it in a project where it will not matter.