Rule 23 (at least as at 26 June 2009 - there may have been amendments since):

23 Exceptions and Applications to Strike Out
(1) Where any pleading is vague and embarrassing or lacks averments which are necessary to sustain an action or defence, as the case may be, the opposing party may, within the period allowed for filing any subsequent pleading, deliver an exception thereto and may set it down for hearing in terms of paragraph (f) of subrule (5) of rule (6): Provided that where a party intends to take an exception that a pleading is vague and embarrassing he shall within the period allowed as aforesaid by notice afford his opponent an opportunity of removing the cause of complaint within 15 days: Provided further that the party excepting shall within ten days from the date on which a reply to such notice is received or from the date on which such reply is due, deliver his exception.
[Subrule (1) amended by GN R2164 of 1987, by GN R2642 of 1987 and by GN R1262 of 1991.]

(2) Where any pleading contains averments which are scandalous, vexatious, or irrelevant, the opposite party may, within the period allowed for filing any subsequent pleading, apply for the striking out of the matter aforesaid, and may set such application down for hearing in terms of paragraph (f) of subrule (5) of rule (6), but the court shall not grant the same unless it is satisfied that the applicant will be prejudiced in the conduct of his claim or defence if it be not granted.

(3) Wherever an exception is taken to any pleading, the grounds upon which the exception is founded shall be clearly and concisely stated.

(4) Wherever any exception is taken to any pleading or an application to strike out is made, no plea, replication or other pleading over shall be necessary.