I am afraid you won't like my answer but I am opposite. I hate HL washer:
- They drain the juice so quickly that I have to fill the reservoir frequently.
- They spray onto the hood.

So, in all my cars with this HL washer feature, I disable them.

For my 2006 X5 3.0i, I simply open the fuse box near the firewall, removed the fuse controlling the HL washer, and lay the fuse there. I made a small label "HL washer fuse" and tape it to the fuse for future reference.

I don't miss the HL washer, many cars out there simply don't have this useless feature (useless to me, but useful for others).

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT