I feel the secret to a clean fire is keeping a good bed of HOT coals under the splits.
You get that going and you could throw a concrete block in there and it'll burn!
Oh yeah... pre-heat the splits before you put them in the firebox. Makes a world of difference.
New Braunfels Hondo Offset
New Braunfels Bandera (Refurbished, Modified & Improved)
32 year old Char-Broil 450
1996 Blue Weber SS Performer
2003 Black Weber SS Performer
Weber 22.5 OTS converted to OTG with rotisserie & Smokenator
Weber SJS & modified stock pot Mini-WSM
STOK Island gasser