Well after about a month and half and about 25 bags I decided today to do a deep cleaning. Went well... cleaned the exchange tubes really good. Have a shop vac with a drywall bag so went through and got all loose ash. Cleaned the back and top plates good. Dumped the ash in ash box. Took about 25 minutes. Got behind the exhaust hole in the back of the right plate with shop vac and got some of that exhaust ash. Will do another deep clean in about 4-6 weeks.