Should we remove all our attic insulation? Keep most but only remove the soiled areas? Don t remove any insulation?

We are looking to increase the insulation in our attic (because of ice dams collecting during the winter). Most contractors will add cellulose on top of the pre-existing insulation (we have fibreglass Batts), that should cost $900 to insulate. But we had 2 contractors inspect the attic and both noticed some bird... show more We are looking to increase the insulation in our attic (because of ice dams collecting during the winter). Most contractors will add cellulose on top of the pre-existing insulation (we have fibreglass Batts), that should cost $900 to insulate. But we had 2 contractors inspect the attic and both noticed some bird droppings. They are telling us that we should remove all the existing Batts (because of risk infections), disinfecting the attic then blowing lots of cellulose. This job is now $3900! Is it worth it and must be done?
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