The influence of an evil eye is a fact; if anything would precede the destiny it would be the influence of an evil eye, and when you are asked to take bath (as a cure) from the influence of an evil eye, you should take bath. (Using translation from Muslim 2188)
عَنِ النَّبِيِّ ﷺ قَالَ «الْعَيْنُ حَقٌّ وَلَوْ كَانَ شَيْءٌ يَسْبِقُ الْقَدَرَ لَسَبَقَتْهُ الْعَيْنُ وَإِذَا اسْتُغْسِلْتُمْ فَاغْتَسِلُوا»