I use it on shower tile with a little BKF and bathroom cleaner.

Its also great for removing the limescale that develops at the mouth of faucets.

BKF is -abrasive- to some degree. don't see myself ever using that - only time I will use BKF is for removing polymerized oil/cleaning of cookware. I have used Sodium Percar (which is on my laundy stash), and have sprinkled that on my shower niches-grout joint and let that dwell, where the typical soap scum does happen

If you buy food grade citric acid it works well in some recipes, like sourdough bread to give it extra tang or also some syrups in some desserts.

Indeed, food grade.

Have came across alot of -bath bombs- in my very recent googling

I never had like -baking- as a whole. It was just too precise for my cooking style. Drive me nuts when the wifey does the level with a knife, knock on the measuring spoon, etc. Cooking, yes......got way too many pots, copper and knives to spread among a few households. Now that the babys are more like toddlers, I've been forcing myself to dive into baking just for those memory making days. LOL. Just took delivery today on some Mafter whisks today....went a bit overboard as this 18" is a monster.