castle-docs/content/equipment/laundry/detergent.md
Padreug 5a83f75c7f Document both washing machines and the Marseille soap detergent
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-10-01 10:05:03 +02:00

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---
title: Laundry Detergent (Marseille Soap)
description: How to make and dose the home-made Marseille soap laundry liquid
aliases:
- detergent
- laundry-detergent
- marseille-soap
tags:
- equipment
- laundry
- household
---
# Laundry Detergent (Marseille Soap)
We wash clothes with a home-made liquid made from **Marseille soap flakes and water**. Marseille soap works genuinely well here because our water is **soft** — in hard water it leaves limescale-soap residue, but that isn't our situation.
## Recipe (2 litres)
| Ingredient | Amount |
|------------|--------|
| Marseille soap flakes | 100–120 g |
| Hot water | 2 litres |
| Washing soda (*cristaux de soude*) — optional | 1 tablespoon |
The washing soda is only worth adding for **greasy or heavily soiled loads**. Plain soap and water is fine for everyday washing.
### Method
1. **Dissolve** the flakes in the hot water, stirring until no flakes remain.
2. **Let it rest 24 hours.** It thickens and may separate — that's normal.
3. **Whisk before every use** so the gel is evenly mixed.
## Dosing
> [!tip] Start low — 50–60 ml per load
> Soft water needs noticeably less of everything. Start at **50–60 ml per load**, not 100 ml.
**Over-dosing is the main cause of residue on clothes and build-up in the machine**, and with soft water you hit that threshold sooner than the back of a commercial detergent box would suggest.
If laundry comes out **stiff or smelling soapy, cut the dose further.**
## Where it goes
| Machine | Compartment |
|---------|-------------|
| Bosch Series 6 (first floor) | **Manual compartment on the left** |
| Washroom off the kitchen | *TBD* |
See [[laundry|Laundry]] for the machines themselves.