From ALttP Speedrunning Wiki
Citrus clip is a 1-frame clip technique that works for ◣ slopes.
- Begin on a Y coordinate that ends in
A(i.e. 2 more than a multiple of 8)
- Move 3 pixels west; for this, it is impossible to move 4 pixels, so 2 slash buffers can be used
- Move 5 pixels diagonally north-west
- Move 5 or 6 pixels west, depending on the teleport (5 for upwards; 6 for downwards)
- Move 1 pixel north-west
To find the correct Y coordinate to begin, you can begin below the point you're trying to find and taprepeatedly. This will gradually move you up the slope diagonally until the pixel is hit, at which point you will move 2 or 3 pixels into the wall, completing step 2.