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  #81  
Old 7th July 2020, 10:08 AM
Mike O'Pray Mike O'Pray is offline
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Thanks Bill for all your replies

Mike
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  #82  
Old 7th July 2020, 09:35 PM
JOReynolds JOReynolds is offline
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Default tar removal

Colour developer residues ('tar') are soluble in citric acid, available from home-brew chemists. Both 5% w/v solution work well. It's non-toxic (lemon juice) and almost odourless. Be patient - it takes a day or two to work - give it a stir from time to time. Rinse well with water and then 1% w/v washing soda solution to neutralise retained acid.
This procedure only works with colour developer.
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  #83  
Old 8th July 2020, 01:29 AM
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billcowan billcowan is offline
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Quote:
Originally Posted by Mike O'Pray View Post
Thanks Bill for all your replies

Mike
Pleased to be of help.
Bill
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  #84  
Old 8th July 2020, 11:33 AM
John King John King is offline
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Default Cleaning

It makes one wonder why, if there are so many cleaning products available on the market to clean the processors. Bleach, Citric Acid and in the past I have used a automotive brake cleaning spray to shift the thickest layers of tar, they all work.

All the above can be used (with care in the case of bleach) and cost a lot less than the cleaner sold by NOVA and require a degree of protective clothing why they still sell it, with the accompanying risks.
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