Ornish has some good data substantiating plaque reversal with a <10% fat diet that has ZERO animal fats (including zero eggs and milk products.)
THis is not for the faint of heart.
Plaque is not a completely homogeneous mass. Generally it is composed of a lipid core with or without gangrenous infection. Surrounding it is muscle tissue from the artery, scar tissue and calcium accretions. Some are "soft" almost all fat and some are low fat and mostly scar and calcium.
I think fat is generally present as a sizeable portion of any plaque and this can be lowered by placing the plaque in a very low fat milieu...low serum lipids in the liquid that endlessly bathes the plaques.
Removal of this fat will shrink the plaque but I doubt that little can be done to remove the scar tissue and calcium shell.
As for the pus core, if it is released it is either broken up and removed by the white blood cells

OR it causes an MI

.
All in all, I think the evidence is very good for diminishing plaque with very tight statin control of blood lipids. We must remember that it took 40, 50, or 60 years to make these horrible structures. A drug that shows appreciable results in 2 years might very well be expected to show STARTLINGLY good results in 10 or 20 years!
Alas, the REVERSAL study was less than heartening but even there atorvastatin (80mg high dose) reversed plaque by a teeny -.4% over 18 months. But this compares favorably with pravastatin (40 mg. weak statin) users who got a significant INCREASE over 18 months (+2.7%.)
Since the tendency, if nothing is done, is for the plaque burden to increase with time, anybody who can get status quo or a decrease of .4% is winning this game. Goal of LDL <100mg/dL was achieved by 97% of the atorvastatin (Lipitor) users but only 67% of Pravachol users.
More studies are needed but measuring plaque isn't cheap or easy to do...except at autopsy!
But I think the evidence is pretty good to assume that levels of LDL below 70, the current super-goal for proven atherosclerotic people, will reverse plaque at a decent rate. Especially if even LDL<100 gets some small results.