device/method for keeping water-based topical for some time soaking on scalp

Dear all,

I was wondering if anybody was aware of a device/apparatus/method for keeping a water-based topical (i.e., very runny/liquid) for some time (let's say at least for5 or 10 minutes) completely soaking the scalp of my forehead? I have tried using a salad bowl, kneeling down on he floor in the shower, but due to the extreme bending of my neck to keep my forehead soaking in the liquid topical, after 2 minutes I get extreme pain in my neck...any ideas/suggestions? thanks!

just soak a cotton cloth in the liquid and put it on your head that will keep it wet for 20-30 min may be.