Do I have to use powdered detergent?

You can put plenty of detergent in the toilet bowl. It will break up the toilet paper and other things blocking the toilet. This method may take some time to...

Tide or All both clean very well; they both take out stains and unwanted smells.

Yes.

You can use a 3:1 water to vinegar mixture to wash the crystal.

No, powdered sugar has the correct consistency and using white sugar would just make sugary butter. White sugar is grainier than powdered sugar.

No. Powdered milk is dry, and milk is wet. If you add milk to it, it will get soggier.

Start with one tablespoon and add a second if you want. Whipped cream just makes it thicker and creamier.

If you are using milk paint on drywall, you may want to add an acrylic binder to the first layer for a more opaque finish.

Any standard dishwashing liquid will work and shouldn't harm your baby.

You can just take regular sugar and put it in the blender, and blend it until the sugar becomes a powder.