Using a hand mixer, Combine 300g Bicarbonate of Soda with 3 tablespoons of either water or liquid castle soap, until wet-sand consistency is reached.
Add a few drops of your favourite essential oils (citrus oils work well with the Citric Acid addition in the next step...) Mix well.
Add 100g Citric Acid and mix for at least 20 seconds.
Working fast, press into small silicone baking forms and allow to dry.
Remove from forms, plop into toilet bowl, allow to dissolve and fizz, then scrub!
Store tabs in an airtight container.