Short term laundry service in Downtown for foreign visitors

Hi,

We are visiting Houston from Germany to attend a conference. Since we cannot transport our business shirts and pants without them needing cleaning/ironing. We are being hosted in a building that offers no laundry service.

We are scheduled to arrive at around 4pm on the 2nd of June (Friday), and need our clothes back on Sunday evening (4th of June). We are unfamiliar with how laundry services in the US work, would anyone be able to give us a recommendation on how to handle this?

I tried contacting the support of https://www.usehamper.com/, but they seem to not answer.

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Thank you very much in advance!