your rawhide seems to have been left in too long and some hides will not slip very easy and some will. your mixture might be too strong as well. also thid method does not work when the weather/water is cold-ish but other than that dont quit rawhiding! you will find what works for you weather it be slipping or scraping. scraping is very natural and seems to be the best way for ME it just takes some more work. good luck!