Hydrogen Peroxide is really good with blood stains. I mean really good. I didn't even have to scrub. I just blotted with a cotton ball, and they were gone.
Vinegar when mixed with water is really good at getting grease off of the wall behind my stove.
And, I needed to unclog my drain, but I couldn't get down far enough with my needlenose pliers, and draino is too expensive. So I pushed two-ish TB of baking soda down the drain, poured in some vinegar and closed the drain with the plug. I waited 15 minutes to let it do its thing, and then flushed the drain with boiling water. Holy cow...so cool.
Cleaning is definitely the weakest of my household skills. I found that it's much better to do it all in one push than try to get myself start again after I've stopped. And it's much more motivating to pick up a few things to keep it clean, than staring at a dirty room that needs to be cleaned. However, I do the later more often than I do the former unfortunately.