Soi Klong is the road that runs alongside a small canal parallel to Pethakasem Road from the centre of town heading to the North. I think the hardware store mentioned is the one on the right at the area known locally as 48 rai market which is a large open area of land which has a busy market in the evenings.
Really interested to hear you are looking for a dryer. My wife and I have looked at opening a laundry and adding one dryer was a priority. The only issue here is the rent and costs vs the amount we can charge from these machines and how much use they would get. I think as you see at most places laundry is built in with several other businesses. We have actually looked at something in her village where a small one level shop is much more affordable to do such a business.