Everything you need to scour cellulose fibres. 100ml of Synthrapol & 500g Soda Ash. This combination will prepare your fibre to accept the dye most readily.
Synthropol is a non-ionic a soap that is used for scouring and to remove excess dye particles from synthetic dyes that could cause back staining on fabric. Use sparingly, 10ml per lb of fiber.
Soda Ash (sodium carbonate) is the same as washing soda and used to bump up the pH to help remove stubborn starches and residues in your cloth before dyeing.