What you need: 3 white candles (tea lights are fine), cheesecloth/reusable teabag, lavender, coconut milk, bay, rosemary, sage, sweetgrass, and a clean towel.
Before you do anything, make sure that the area that you are going to bathe in is clean. You can do the whole spell in the bathroom, or you can start at altar and move everything to the bathroom when you are ready. When everything is clean, burn the sage and sweetgrass (as smudge sticks, or incense) and clear the area.
Arrange the candles in a triangle on your altar, or around your bathtub. Light the candles and add the lavender, rosemary, and bay to the sachet while saying:
With the candles around the bathtub, fill the tub with water (make sure it is comfortable to you). Pour in the coconut milk and the tightly closed sachet. Get into the bath and soak for at least 15 minutes, thinking happy, clean thoughts. When you are done, dry yourself off with the clean towel. You are now a "clean slate" as it were to receive a blessing or a protection spell.