Commentary for Avodah Zarah 137:2

Ravina thought that if there was 100 times more vinegar than mouse parts that the mouse would be “neutralized.” Meaning that the mixture would be permitted, as long as the volume of the mouse was removed. This is the rule with regard to terumah that falls into non-holy produce. If there is 100 times more non-holy produce, the mixture is permitted, although he does have to remove the volume of terumah that fell in.

The mishnah about terumah being neutralized at a ratio of 100 to 1 referred to cases where one cannot taste the terumah. For instance terumah oil falls into ordinary oil. But if terumah spices fall into food and they can be tasted, the ratio does not matter. The same should be true for the case of a mouse—it should be subject to the test of taste.