AT200 Broad band AFR sensor is Black as night after removing CES

[Ishrub]

OK, I have removed my CES headers with the standard R3 1 3/4" (?) collector outlet size with @HansO tune and noticed the PC5 AT200 broadband O2 AFR sensor was black as night.
I am replacing with another CES header with a 2" collector outlet and single big bore exhaust muffler so it should run a bit leaner. At this stage not planning to hassle @HansO for a new tune as the current one seems quite rich and safe and no BIG change.

Should I clean the O2 and if so with what?
I have a 5 litre bottle of Isoproyl alcohol so no shortage of that!

 

[scot in exile]

When I removed mine it was also as black as you are describing but as the bike was running fine I just reinstalled it , If we hear any different I will take it off and clean it.

 

[R-III-R Turbo]

Not sure I'd use alcohol to clean it, i know ethanol (alcohol) fumes cause oxygen meters to go arseways, might be the same for exhaust lambdas. Safer stick to petrol

 

[Ishrub]

Thanks @R-III-R Turbo good info, glad I didn't do anything, followed @scot in exile 's lead and just put it in the new CES as it was. Will see how it goes.

 

[Claviger]

Generally sounds about normal, black is rich, rich is safe and makes power.

 

[scot in exile]

True to an extent, if way to rich it can actually be very harmful to the engine as gas is a natural degrease'r and can break down the oil lubricant on the cylinder walls causing premature wear.
Eff that do you have the pipes back yet????