Is one to wash his hands after touching other insects and impure animals?
Some Poskim[1] rule one is to wash his hands if he touched an impure animal. Others[2] rule it is not necessary to wash hands after touching an impure animal.
[1] Yifei Laleiv 1:24; Lev Chaim 2:6; Ruach Chaim 2; Kaf Hachaim 4:81
[2] Shaareiy Teshuvah 4:12; M”B 4:45; Admur 97:3 regarding that one is not required to wash hands before Davening if one touched an impure animal, however it can be rightfully argued that there Admur was not discussing whether doing so resides an evil spirit and hence no proof can be brought. [See also Piskeiy Teshuvos 4 footnote 256]
Must one clean his hands in other ways? Shaareiy Teshuvah and M”B ibid rule one is to clean the hands in other ways. However from Admur ibid it is implied that this too is not necessary.