MamaSuds Castile Soap

Important note on castile soaps

Castile soap is one of the most versatile basics to keep on hand, but the quality matters. Some “castile-style” soaps include extra additives for scent, foam, or shelf stability that don’t improve performance and can be harder on sensitive skin. Since this type of soap gets used on hands, surfaces, and sometimes even laundry or dishes depending on how you dilute it, I keep the ingredient standard high.

What I avoid in castile soaps

For this category, I avoid undisclosed or toxic fragrance blends, methylisothiazolinone (MIT), quaternary ammonium compounds (quats), petroleum-based solvents, and coating agents like dimethicone. I also steer clear of vague “proprietary blends” where it’s not clear what’s actually providing the scent or preservation.

What I look for instead is a true soap made from saponified oils with a short, transparent ingredient list.

Product description

MamaSuds Castile Soap is a simple, soap-based staple made from saponified oils designed to be diluted and used across everyday cleaning tasks. It’s the kind of multipurpose product I like to keep under the sink because it can replace a bunch of single-use cleaners when you mix it correctly.

It works well for routine cleaning where you want something effective, but still minimal and straightforward.

What I like

I like that it’s a true soap-based formula that keeps the ingredient list simple.

It’s multipurpose and can be diluted for different uses, which helps me simplify my cleaning routine.

It feels like a practical “base product” I can build from without relying on heavy fragrance or unnecessary additives.

Things to keep in mind

Castile soap is concentrated, so dilution matters. Using too much can leave a little residue, especially on certain surfaces.