Hi Pete;
First off, your Janitrol should not be streaking black smoke clear to the tail. I expect you need to get into the heater and check the spark plug (or just replace it) and check the spray pattern of the nozzle. You can download the Janitrol heater service and parts manual from: www.csobeech.com/files/Janitrol-MaintenanceManual.pdf . It will give you an exploded view of the heater parts and procedures to test the components.
Kristin Winter, who also writes for the Piper Flyer magazine and flies a PA 30 Twin Comanche reports that Easy Off oven cleaner is the quickest and most effective belly cleaner. She cautions that it must be used in a well ventilated area, must be rinsed with water and wiped off immediately after application and then rinsed again.
Others say that Easy Off is very caustic and that they would never use it on bare aluminum, but only on a good painted surface.
Kristin is a very experienced A & P mechanic and pilot and without doubt has tried the other cleaners such as GOOP hand cleaner (without pumice) and rags, Aviation Simple Green (must get the aviation kind) mixed 50/50 with water; Sportys and Aircraft Spruce sell a product called Aero Glaze Dry wash that others recommend.
According to installation information of a Janitrol heater in place of the orginal Southwind heater the exhaust pipe should extend 2 inches beyond the skin and the angle of the scarf cut on the pipe should have the longest side forward. This creates a vacuum to help move the exhaust out into the slipstream.
I'm following up with some sources and will post their advice within the next couple of days.

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The GDL 82 a low-cost solution to the ADS-B “Out” mandate. You must aleady have a WAAS GPS receiver to feed high integrity position data to the GDL 82. If you’re so equipped , you can buy the GDL 82 for $1799. It will work with your KT76A—provided that your KT-76A is married to an encoder—or with any existing Mode A or Mode C transponder.
The installation consists of installing the GDL “box”, that measures 3.3 inches by 1.5 by 9.2 inches at a convenient place—probably upstream of the transponder antenna in the coaxial cable between your transponder and the transponder antenna. That part is very easy.
The second part requires the installation of a GPS antenna. Since GPS antennas must be mounted on an upper surface of the airframe, antenna installation requires mounting the antenna—as near the centerline of the aircraft as possible—and routing an additional coaxial cable from the antenna to the “box.”
The GDL 82 will work with all existing Mode A and Mode C transponders but will not work with Mode S transponders. There’s not much more to it. The avionics installer will need to input some confirmation information, and you’ll need to fly a confirmation flight but that’s easy.
The GDL 82 transmits on the 978 MHz and is called a Universal Access Transceiver (UAT). Installation fulfills the 2020 mandate for ADS-B Out.
ADS-B “In” information includes weather, traffic, METARS, TAFs, NOTAMS, TFRs and other very helpful information in your cockpit.
If you do not have a WAAS high integrity GPS to tie to the GDL 82, other options include installing a new transponder with a built in WAAS GPS and ADS-B “Out” capabilities such as the Appareo ESG and the Garmin GTX 335. These retail with out installation for $2995.
There is a great deal of information about ADS-B at Garmin’s ADS-B Academy ( www.garmin.com/us/intheair/ads-b ) and in the avionics section of the Pilot Shop the Sporty’s website ( www.sportys.com ).

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