I’ve done it clean several times on TR but have yet to lead it (hoping to redpoint it soon). Probably the most important thing is maintaining your momentum. Those smears are only so good for so long, if you’re being slow and static you waste too much time and will fall off. Instead of statically placing a foot and pushing up onto it, use momentum to push up into the foothold as you place your foot. Herb Stillman always tells me I need to just bound up it.