I did not say anything about deleting bouquets. It won't solve your issue. ABM does not delete dead channels. Enigma2 scanning with "clear before scanning" is also flawed in that only the transponders listed in satellites.xml are interrogated. If a dead channel is on transponder that is not listed, it won't be removed.
Please follow instructions above. If they are not clear, please say which bit is unclear.
As an aside, you should enable the "include not indexed" option.