Effective way to stop bluebirds from attacking their reflection in windows?

The bluebirds are out and about and keep attacking their own reflection in the windows of the house. I do not want to scare them away completely, just stop them from possibly hurting themselves. The bluebird houses are located a ways away from the house, but they still keep coming over and attacking their own reflection. I've looked online already and seen some tips that range from somewhat helpful (window decals) to downright stupid (i.e. soap your windows... yeah, that will really look nice in my neighborhood). Anyway, if any of you have some helpful tips or can point me to a product that you've actually had work for you, I trust your experiences more than the product reviews on Amazon. Thanks in advance.

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