Thank you everybody for the replies! I really do appreciate everybody's advice
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What we ended up doing was soaking the humidifier tub in a 1:3 white vinegar/water bath for approx. 30 mins, then rinsed it out with water and gave it a wipe out with a microfibre cloth.
I had a chat to a different local pharmacy than I normally go to and they had a helpful lady who gave me some CPAP mask/tube soap made by Purdoux, she told us to use a squirt of that in a mixture of 1:5 white vinegar/water for cleaning of the mask and tubing.
So I think going forward I will go with this method for weekly cleaning:
HUMIDIFIER TUB:
1. Soak tub in 1:3 white vinegar/water solution for approx. 30 mins (Except for the rubber seal as I am not sure how the vinegar will affect the rubber), rinse well with water and air dry.
2. Wash the rubber seal with Purdoux CPAP soap & water, rinse with water & air dry.
MASK & TUBING:
1. Take the mask apart and wash the silicone mask cushion with Purdoux CPAP soap & water, rinse with water & air dry.
2. Wash the rest of the mask components & the tubing in a mixture of Purdoux CPAP soap & 1:5 white vinegar/water, rinse with water & air dry.
For the daily routine:
1. I will now empty the humidifier tub each morning and wipe it dry with paper towel, then leave it to sit dry until bed time, then fill it with distilled water.
2. Wipe over the mask cushion inside & outside with CPAP mask wipes.
Hopefully this will keep things at bay.
One question I had though, is it ok to take the humidifier tub out of the machine while it is in cool down mode (still pushing out a low flow of air with the snow flake symbol on the screen). It seems to take about an hour to 1.5hrs for it to cool down of a morning and I can't really wait that long to take the humidifier tub out and empty it as I need to get to work.
Thanks again all