Albertson's is a chain grocery store (almost always has a small hardware section). They have pictures of him in the aisles, so they can probably theorize about what he bought.
I am myself of course extremely curious what was so important that he gets himself yet again on camera that night. I wonder what he was wearing at that point. Wouldn't LE mention if his clothes were not the dark clothes mentioned by D?
I am guessing he went right out to his car, with much less blood on him than many would think - but more than he anticipated and sped off. He had blood on the bottom of his foot just minutes before (the latent print outside D's door) but it wasn't a lot of blood. Still, it doesn't take much blood from his foot to leave victim DNA on the pedals and carpeting (especially) of the car. I wonder if his car carpet has bleach stains. I wonder if he bought bleach at Albertson's and other cleaning supplies.
To me, it looks like he had been thinking about this for a while, and had gone on many false starts on prior nights. For whatever reason, this was the night that everything clicked for him. But did he bring cleaning supplies? I wonder. Maybe he bought trash bags and cleaning supplies after the fact (in keeping with his general pattern of being much less smart than he thinks he is).
Bleach does not destroy DNA, although washing can move it around. It tends to be detectable on fiber for a long time, even after multiple hot water washings in a washing machine, with bleach.
Since he takes another circuitous route back to Moscow the next morning, I do wonder where he disposed of his clothes. Surely he disposed of his clothes, right?