Grease duct cleaning robot.
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Previously:
https://www.homemadetools.net/forum/...742#post178754
https://www.homemadetools.net/forum/...449#post139067
https://www.homemadetools.net/forum/...205#post149916
https://www.homemadetools.net/forum/...594#post205640
https://www.homemadetools.net/forum/...505#post200949