Clozapine has both anticholinergic, cholinergic actions. whats the mechanism?

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Wikipedia says: "While clozapine is a muscarinic antagonist at the M1, M2, M3, and M5 receptors, clozapine is a full agonist at the M4 subset. Because M4 is highly expressed in the salivary gland, its M4 agonist activity is thought to be responsible for the hypersalivation."
 
Davydov L, Botts SR, Clozapine-induced hypersalivation. Ann Pharmacother. 2000;34(5):662-665.

Bai YM, Lin CC. Chen JY, et al. Theraputic effect of pirenzepine for clozapine-induced hypersalivation: a randomized, double-blind, placebo-controlled, cross over study. J Clin Psychopharmacol. 2001; 21(6):608-611.

Calderon J. Rubin E. Sobata WL. Potential use of ipratropium bromide for the treatment of clozapine-induced hypersalivation: a preliminary report. Int Clin Psychopharmacol. 2000;15(1);49-52.
 
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