De/re every week (I do mine every Friday morning), it might seem like a slight chore but it does prevent excess residue buildup. Wash your hair twice a week, once with shampoo & conditioner (I recommend the Loreal Serie Expert range) and the other without any product but make sure the water goes through the lace and also rinses your scalp, I use the option 2 setting on my shower head (the one in between free fall and jet massage). Wearing a shower cap might be a good idea, and try using 'dry shampoo' in between washes if need be; I recommend 'Batiste Original' which is unscented but make sure you don't overuse it and avoid using in hairline area. Also its very important that you use a scalp sealer. Use a leave-in conditioner every 3-4 days or so, I'd use the one from Loreal Serie Expert range and avoid anything from HD as those just aren't true salon quality.
All these things not only solve the problem but should make your HS last much longer.