What's the irregular form of clean?

[Cleany]

English Language Tests, Intermediate level

ESL/EFL Test #260 "Irregular Verbs Test (8)", question 1

Curt ......... down his pencil because he was so frustrated with the difficulty of the intensive exam.

(a) laid
(b) laying
(c) lying

English Language Tests, Intermediate level

ESL/EFL Test #260 "Irregular Verbs Test (8)", answer 1

Curt laid down his pencil because he was so frustrated with the difficulty of the intensive exam.

Correct answer: (a) laid
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Irregular Form of clean?

Cleany

[Mister Micawber]

.
None that I know of: clean/cleaned/cleaned; clean/cleaner/cleanest.
.
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Native English teacher at Mister Micawber's