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Road question, but what brings the colour up on mucky road tyres?
I found a bit of neat fairy liquid did the trick, but bare in mind that you want to wash it off pretty well afterwards.
Muc Off seems to work for me 🙂
Cif cleans my trainers up pretty well, not tried it on tyres but reckon it should work.
I find muc off to be weak to the point of uselessness nowadays, bit of an expensive waste.
Will try neat fairy liquid + toothbrush!
You have enough free time to clean your tyres with a toothbrush?
Will try neat fairy liquid + toothbrush!
Soaps/detergents need water to work - it's actually the water that does the cleaning with the detergent breaking the surface tension. Also the item to be cleaned needs to be wet (which will give it a -ve charge) so that the (also) -ve charged soapy water can carry away the dirt.
In laymans' terms: water brings the fairy liquid alive!
You have enough free time to clean your tyres with a toothbrush?
You should see the state of his teeth 
I'm from Rochdale - we don't have teeth. We do play great banjo though..
If they are folding tyres, bung them in the washing machine with the rest of your biking kit.
Andy
^^ don't do that with cotton ply sidewall's...
I use washing up liquid and a pan scourer, not a harsh one just a normal "green & white" one..