My scalp can start acting funny when I have alot of newgrowth so I wash about 3 days before I relax. I use a light clarifying wash like design essentials organic cleanse. I usually deep condition with a combo conditioner. I either use a cholesterol or a mix of aubrey organics honeysuckle and rose conditioner and aubreys gpb. It usually isn't any different than my weekly dc. I do however make sure I have fit in a heavier protein treatment the week before. I use cpr or aphogee 2 minute reconstructor for this. Since I start doing my hair this way, it is a lot stronger. I underprocessed my self the last two times but that is because I have a tendency to use too much base and not enough relaxer.
Even so, my hair is still pretty strong considering the texture differences.
After I relax I like to use motions neutralizing conditioner or motions silk protein conditioner for ten minutes before I wash. Then I use proclaim neutralizing shampoo and follow with one of my favorite moisturizing conditioners.