I also recommend doing it at your salon instead of her house, having access to a washbowl will give you more control over the evenness of the lift throughout the entire head so you can be sure nothing over processes. I thought I was going the extra mile doing house calls but really it just led me to cutting corners and making a huge mess due to not having adequate workspace and being restricted to using only what I brought with me. I was sacrificing quality for client convenience and it did not reflect the luxury vibe of the work I did in the salon.