There are a lot of recipes and commercially available quenchers of biotin. It is a big issue particularly in liver and lymph nodes, as you already see the issue yourself. According to my experience none can do the job sufficiently, e.g. to "mask" completely the endogenous biotin. You can get certain signal to noise ratios for sure but almost never as good as expected. On top you introduce additional steps in the procedure, which makes it more complicated and, therefore, prone to more errors in the end.
I would rather suggest that you switch to avidin-biotin free system, rather than using quenching of the endogenous biotin.