Doing what you suggest has an immense issue of selection bias. You go into youtube trying to see if it recommends right wing videos, and you're going to be a lot more likely to click on right wing videos. Which then informs the algorithm that you're interested in right wing videos. The correct way to test this is to write a program, not to just watch youtube while logged off.
I used selenium to do exactly this. Start at a video, and do a breadth based search based on recommendations. No such preference for far right videos exist. It's frequently get into a hole of certain topics (e.g. first recommendation is on knitting, subsequent recommendations have a higher chance of being about knitting, and so on), but there was no substantial representation of right wing content. And it's not just me with a selenium driver. Other researchers have examined youtube and reached the same conclusion: https://arxiv.org/pdf/1912.11211.pdf