https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/5D-mark-i-mode-knob-issue/m-p/315480#M73761 <P>Rubber part of mode knob has become sticky and black substance comes off when touched. I have never used anything on it to have caused this. And I am not able to clean it off. I am hoping that Canon can provide a fix. This should not happen.&nbsp;</P> Thu, 06 Aug 2020 16:24:19 GMT Howardl 2020-08-06T16:24:19Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/5D-mark-i-mode-knob-issue/m-p/315480#M73761 <P>Rubber part of mode knob has become sticky and black substance comes off when touched. I have never used anything on it to have caused this. And I am not able to clean it off. I am hoping that Canon can provide a fix. This should not happen.&nbsp;</P> Thu, 06 Aug 2020 16:24:19 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/5D-mark-i-mode-knob-issue/m-p/315480#M73761 Howardl 2020-08-06T16:24:19Z